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A source emits a sound of frequency of 400 Hz, but the listener hears it to be 390 Hz. Then

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a
The listener is moving towards the source
b
The source is moving towards the listener
c
The listener is moving away from the source
d
The listener has a defective ear

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detailed solution

Correct option is C

Since apparent frequency is lesser than the actual frequency, hence the relative separation between source and listener should be increasing.


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